260 BOTANY. Pinus edulis, Engelm. in Wisliz. Mem. note 2.—Similar to the last, but with more slender, entire leaves, mostly in pairs, rarely in threes; stami¬ nate flowers surrounded by a 4-leaved involucre ; anthers with a knob or short spur; cones and seeds similar to those of the last species, only a little smaller; cones usually but IJ' long; cotyledons as in previous species. Camp Bowie, Arizona, Rothrock (493). Common from Southern Colorado through New Mexico to Arizona. The two species here described, together with the slender and 3-leaved P. cembroides, with harder shells to the larger seeds, and 8-12 cotyledons, and the little-known 4-5-leaved P. Parryana of the northern part of Lower California, constitute a small group of very peculiar Pines, which we may designate as the Cembroid Pines, characterized by the leaves of the flexilis group (with entire margins, peripheral ducts, and deciduous sheaths), by the seeds of Cembra and by the cones and scales of Pinaster. Perhaps it would be proper not to lay too much stress on the number of leaves and minor characters, nor on their geographical difference, and to unite them under the oldest and most appropriate name of P. cembroides, Zucc, though systematists, counting the leaves, have separated them widely in their books. Tliere is no pine entirely analogous to them in the Old World, unless we should refer here the little-known P. Bungeana, Zucc; Murr. Conif Jap. 18, of Northern China. It has similar, small, subglobose cones, though with less prominent knobs, but armed with recurved prickles; the seeds are smaller, with a very distinct wing, the leaves in threes lose their sheaths as our Nut-pines do, but are serrulate, and have several peripheral ducts, but, singularly enough, also usually a single interior or paren¬ chymatous one, forming thus a link between several groups. Pinus Aeizonica, n. sp.—A middle-sized tree, 40° high, 2-3° in diam¬ eter; branches squarrose, with persistent bracts; leaves in fives, 5-7' long") i" wide, closely serrulate, in a sheath OA^er I'Jong (when old less than half as long) ; oval cone 2|' long, 1^' thick ; scales with a prominentknob, which in the lower ones is recurved, armed with a recurved prickle. On the Santa Rita Mountains, in Southern Arizona, Rothrock (652),in 1874. "The best lumber of that region, there called yellow pine."This seems to be a meagre account to found a new species upon in a genus